MCH3477-TL-E Equivalent & Substitute Parts

Part Overview

The MCH3477-TL-E is an N-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 4.5A continuous drain current at 25°C. This device is packaged in SC-70FL/MCPH3 surface mount configuration and is designed for general-purpose switching applications requiring low on-resistance performance.

The MCH3477-TL-E carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	20	V
Current - Continuous Drain (Id) @ 25°C	4.5	A
Rds On (Max) @ 2A, 4.5V	38	mOhm
Gate Charge (Qg) (Max) @ 4.5V	5.1	nC
Power Dissipation (Max)	1	W
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-70FL/MCPH3	—

Substitute Part Grouping Explanation

Substitution of the MCH3477-TL-E is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

FET Type: N-Channel topology must be maintained
Drain to Source Voltage (Vdss): Minimum 20V rating required
Continuous Drain Current (Id): Minimum 2.2A acceptable for reduced current applications
On-Resistance (Rds On): Maximum 65mOhm at specified gate voltage
Gate Charge (Qg): Maximum 5.85nC for switching performance
Power Dissipation: Minimum 395mW acceptable for reduced power applications
Operating Temperature: Maximum 150°C junction temperature

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount required
Package Configuration: SC-70 or SOT-323 compatible footprints

The PMF63UNEX meets these substitution criteria while offering Active product status and improved supply availability.

Parameter Comparison

Parameter	MCH3477-TL-E	PMF63UNEX	Unit
Manufacturer	onsemi	Nexperia USA Inc.	—
FET Type	N-Channel	N-Channel	—
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	20	20	V
Current - Continuous Drain (Id) @ 25°C	4.5	2.2	A
Rds On (Max) @ 2A, 4.5V	38	65	mOhm
Gate Charge (Qg) (Max) @ 4.5V	5.1	5.85	nC
Vgs (Max)	±12	±8	V
Input Capacitance (Ciss) (Max) @ 10V	410	289	pF
Power Dissipation (Max)	1	0.395	W
Operating Temperature (TJ)	150	150	°C
Mounting Type	Surface Mount	Surface Mount	—
Package / Case	SC-70FL/MCPH3	SOT-323	—
Product Status	Obsolete	Active	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	—
REACH Status	REACH Unaffected	REACH Unaffected	—
ECCN	EAR99	EAR99	—

Engineering Selection Recommendations

Product Status Consideration: The MCH3477-TL-E is classified as Obsolete. The PMF63UNEX carries Active product status, ensuring continued manufacturing support, supply chain availability, and compliance with current regulatory standards.

Regulatory Compliance: Both devices maintain REACH Unaffected status and EAR99 export classification. The PMF63UNEX is RoHS3 Compliant, providing enhanced environmental compliance for new designs and manufacturing processes.

Electrical Performance: The PMF63UNEX operates at reduced continuous drain current (2.2A versus 4.5A) and reduced power dissipation (395mW versus 1W). These characteristics make the PMF63UNEX suitable for applications where the MCH3477-TL-E current and power ratings exceed design requirements. The on-resistance specification (65mOhm maximum) remains within acceptable switching performance parameters.

Package Compatibility: Both devices utilize surface mount technology with compatible SC-70/SOT-323 footprints. Physical pin configuration and thermal characteristics support direct substitution in existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the PMF63UNEX directly replace the MCH3477-TL-E in all applications?

A: Direct substitution is applicable when the application continuous drain current requirement does not exceed 2.2A and power dissipation does not exceed 395mW. The PMF63UNEX maintains identical 20V Vdss rating and compatible surface mount packaging. Applications requiring the full 4.5A continuous current capability of the MCH3477-TL-E require alternative solutions.

Q: What are the key electrical differences between these devices?

A: The primary differences are continuous drain current (4.5A versus 2.2A), power dissipation (1W versus 395mW), on-resistance (38mOhm versus 65mOhm), and maximum gate voltage (±12V versus ±8V). Both devices share identical 20V Vdss rating, similar gate charge characteristics, and 150°C maximum junction temperature.

Q: Are the packages physically compatible?

A: Both devices use surface mount SC-70/SOT-323 packaging. The footprint and pin configuration are compatible, allowing direct PCB layout substitution without redesign.

Q: What is the supply status difference between these parts?

A: The MCH3477-TL-E is Obsolete with limited remaining inventory. The PMF63UNEX is Active with 131,100 pieces in stock, ensuring reliable long-term supply availability and supporting ongoing production requirements.

Q: Does the PMF63UNEX meet the same regulatory requirements?

A: Both devices maintain REACH Unaffected status and EAR99 classification. The PMF63UNEX additionally carries RoHS3 Compliance certification, providing enhanced environmental compliance for current manufacturing standards.

Q: What applications are suitable for the PMF63UNEX substitution?

A: The PMF63UNEX is suitable for low-to-medium current switching applications operating at 20V or below, where continuous drain current does not exceed 2.2A and power dissipation remains below 395mW. Applications include gate driver circuits, low-power switching regulators, and general-purpose logic-level switching.

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